Electric Car Maintenance – What’s Different from Petrol Cars

Switching to an electric vehicle (EV) involves learning new terms: kilowatts, range, and regenerative braking. But there is one area where the list of things to learn actually gets shorter: EV maintenance.

One of the most appealing aspects of EV ownership is the drivetrain's simplicity. Without the combustion, compression, and exhaust cycles of a petrol engine, there are simply fewer things that can rattle, leak, or wear out. However, "low maintenance" doesn't mean "no maintenance." Understanding the specific needs of an electric car is vital to safety, reliability, and the protection of your vehicle's resale value.

Why EVs Need Less Maintenance

The primary reason for the difference in maintenance EV requirements is the drastic reduction in the number of moving parts. A traditional internal combustion engine (ICE) has hundreds of moving components, pistons, valves, crankshafts, and camshafts, all rubbing against each other at high temperatures and pressures. An electric motor typically has fewer than 20 moving parts.

Because there is no combustion, you simply don't have the by-products of burning fuel to deal with. This means you can say goodbye to:

Engine Oil Changes: There is no engine oil to degrade or get contaminated with soot.
Spark Plugs: No ignition system means no plugs to foul or replace.
Exhaust Systems: No exhaust gases means no mufflers, catalytic converters, or particulate filters to clog or rust.
Belts and Chains: Timing and fan belts, which are critical failure points in petrol cars, are absent in EVs.

Components You’ll Never Have to Replace Again

For many drivers, the realisation that they will never have to pay for a clutch replacement or an oil filter change is a significant psychological benefit. But the biggest benefit often comes from the brakes.

Regenerative Braking:

In a petrol car, braking is a waste of energy; friction turns kinetic energy into heat and dust. In an EV, when you lift your foot off the accelerator, the electric motor reverses its function to become a generator. It slows the car down by magnetically resisting the rotation of the wheels, capturing that energy back into the battery. This means the physical brake pads and discs are used much less frequently, often lasting twice or even three times as long as those on a standard car.

Battery and Software Upkeep Explained

While you lose the oil changes, you gain a new focus: the high-voltage battery. EV maintenance involves monitoring the battery's health.

State of Health (SOH): Servicing often involves a diagnostic check of the battery's SOH. This tells you if any individual cells are degrading faster than others.
Charging Habits: While not "maintenance" in the traditional sense, how you charge affects the battery's lifespan. Most manufacturers recommend keeping the charge between 20% and 80% for daily use to prolong its life, only charging to 100% for long trips.

Software Updates:

The modern EV is effectively a computer on wheels. Software is a critical "component." Over-the-air (OTA) updates can improve range, charging speed, and even infotainment features without the car ever visiting a garage. Ensuring your software is up to date is a key part of modern vehicle care.

How to Ensure Long-Term EV Reliability

Despite their simplicity, EVs still rely on fluids and mechanical components that require maintenance.

Coolant: The battery management system uses coolants to keep the high-voltage cells and the inverter at an optimal temperature. This fluid needs to be checked and replaced according to the manufacturer's schedule to prevent overheating.
Transmission Fluid: While they don't have complex multi-gear gearboxes, EVs often have a reduction gear (single-speed transmission) that requires lubrication. Products like Shell Spirax are often used in these sealed units to ensure smooth power delivery.
Tyres: EVs are significantly heavier than petrol cars due to the battery weight, and the instant torque can wear tyres faster if you drive aggressively. Regular rotation and pressure checks are essential to prevent uneven wear.
Screenwash: Just like any car, keeping your view clear is vital. Top up your screenwash regularly, it’s one of the few DIY tasks that remains the same!

Comparing Maintenance Requirements: EV vs Petrol

When analysing EV maintenance costs, the consensus among fleet managers and industry data is that scheduled servicing involves fewer steps. There are fewer labour hours involved in checking an electric motor than servicing a petrol engine. However, repairs to specific EV components (like matrix LED headlights, sensors, or battery modules) can be specialised and complex.

Ultimately, the shift is from "mechanical" maintenance to "electrical" and "software" maintenance. By understanding these differences, you can enjoy the reliability of your EV for years to come.